Join Date: Jul 2005
Bikes: 1984 Trek 520; 1990s Peugeot (Canadian-made) rigid mountain bike; 2007 Bike Friday NWT; misc others
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This is a good opportunity to develope some diagnostic skill. Stand it upside down or put it on a stand or rack, spin the wheel and observe the rim and tire as they rotate past a fixed spot, like a brake pad. It should spin smoothly with no side to side motion. If it is out of true the rim will seem to move closer to and farther away from the brake pad as it goes around. That should be fixed by a bike shop. If the tire is not seated right there will be a bulge or flat spot somewhere in the circumference. That might be fixed by deflating and reinflating the tire. It there is a bump in the tire right by the valve stem, you may have trapped the reinforced part of the tube around the base of the valve stem under the tire rim. Deflate the tire, push the valve stem well into the tire, then pull back out. Also grab the wheel and see if it rocks side to side more than a millimetre. In that case the axle cones need to be adjusted. Also check that it is firmly bolted into the dropouts. Also make sure no other part of the bike like the rear triangles of the frame are broken.
You posted in the fixed gear forum, but if it is not a fixed gear bike and has a rear gear cassette, it is normal to see a little irregular oscillation in the cassette as the rear wheel spins.
Last edited by cooker; 01-26-09 at 04:20 PM.